<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
	<title>框架div</title>
	<style type="text/css">
	.header{
		height: 100px;
		width: 980px;
		background-color: blue;
		margin: 0 auto;
		margin-bottom: 15px;margin-top: 15px;
	}
	.content{
		height: 500px;
		width: 980px;
		background-color: red;
		margin: 0 auto;
		margin-bottom: 15px;

	}
	.footer{
		margin: 0 auto;
		height: 100px;
		width: 980px;
		background-color: yellow;
		margin-bottom: 15px;

	}
	</style>
</head>
<body>
<div class="header"></div>
<div class="content"></div>
<div class="footer"></div>
	
</body>
</html>